<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
        <form action="login" method="post">
            username :<input type="text" name="username"><br>
            password :<input type="text" name="password"><br>
            <input type="submit" value="提交">
        </form>
</body>
</html>